21432414 has 8 divisors (see below), whose sum is σ = 42864840. Its totient is φ = 7144136.

The previous prime is 21432413. The next prime is 21432443. The reversal of 21432414 is 41423412.

It is a sphenic number, since it is the product of 3 distinct primes.

21432414 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21432413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1786029 + ... + 1786040.

It is an arithmetic number, because the mean of its divisors is an integer number (5358105).

Almost surely, 2^21432414 is an apocalyptic number.

21432414 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21432414 is a wasteful number, since it uses less digits than its factorization.

21432414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3572074.

The product of its digits is 768, while the sum is 21.

The square root of 21432414 is about 4629.5155254087. The cubic root of 21432414 is about 277.7732135902.

Adding to 21432414 its reverse (41423412), we get a palindrome (62855826).

The spelling of 21432414 in words is "twenty-one million, four hundred thirty-two thousand, four hundred fourteen".